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I had the HIFI system. I replaced the amp with the Bimmertech amp and used a tune I downloaded from another thread on this forum (you should be able to find that thread by searching for "Bimmertech"). I replaced the front door speakers with Focal IFBMW-S and Focal ISC-100 for the rear. I turned off the center speaker (you can turn off that output in the amp when tuning it). I think the result is much improved.
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